package com.wzy.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.wzy.reggie.common.BaseContext;
import com.wzy.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 过滤器
 * 检查用户是否已经完成登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    public static final  AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的url
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls = new java.lang.String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
        };
        //2.判断此次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.如果不需要处理，直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4.1判断登录状态，如果已经登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录。用户id为：{}",request.getSession().getAttribute("employee"));

            long id = Thread.currentThread().getId();
            log.info("线程id为{}",id);
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //4.2判断移动端用户登录状态，如果已经登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录。用户id为：{}",request.getSession().getAttribute("user"));

            long id = Thread.currentThread().getId();
            log.info("线程id为{}",id);
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        //5.如果未登录，则返回登录结果，通过输出流的方式向客户的页面响应数据
        log.info("用户未登录");
        servletResponse.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次路径是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,requestURI);
            if(match){
                return true;
            }
        }
        return false;

    }
}
